javascript - d3.event.translate contains NaN on zoom for touch devices -


i wrote custom zoom function svg using d3 so:

//zoom behavior function myzoom() {     xpos = d3.event.translate[0];     ypos = d3.event.translate[1];     vis.attr("transform", "translate(" + d3.event.translate + ") scale(" + d3.event.scale + ")"); }

this works fine on non-touch devices, when zoom in on touch devices d3.event.translate array starts containing nan's. when occurs subsequent calls myzoom have issue , zooming stops working.

this error receive is:

error: invalid value <g> attribute transform="translate(nan,nan) scale(0.8467453123625244)" d3.v2.js?body=1:387 attrconstant d3.v2.js?body=1:387(anonymous function)          d3.v2.js?body=1:3860 d3_selection_each                                             d3.v2.js?body=1:509 d3_selectionprototype.each                                    d3.v2.js?body=1:3859 d3_selectionprototype.attr                                    d3.v2.js?body=1:3638 myzoom                                                        fw_tree.js?body=1:2842 event                                                         d3.v2.js?body=1:64 (anonymous function)                                          d3.v2.js?body=1:175 dispatch                                                      d3.v2.js?body=1:4826 mousewheel                                                    d3.v2.js?body=1:4855 wrapper                                                       d3.v2.js?body=1:492

any or pointers appreciated


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